### 湍动能在激波/边界层干扰流动中的影响

1. 1. 中国空气动力研究与发展中心 空气动力学国家重点实验室, 绵阳 621000;
2. 中国空气动力研究与发展中心 计算空气动力研究所, 绵阳 621000
• 收稿日期:2021-03-16 修回日期:2021-05-20 发布日期:2021-05-20
• 通讯作者: 王安龄,E-mail:scmywal@163.com E-mail:scmywal@163.com
• 基金资助:
国家重点研发计划(2019YFA0405202);国家自然科学基金(11802324,12002361);国家数值风洞项目

### Influence of turbulent kinetic energy on shock wave/boundary layer interaction

ZHANG Haoyuan1,2, SUN Dong1, QIU Bo1,2, ZHU Yandan2, WANG Anling2

1. 1. State Key Laboratory of Aerodynamics, China Aerodynamics Researoh and Development Center, Mianyang 621000, China;
2. Computational Aerodynamics Institute, China Aerodynamics Researoh and Development Center, Mianyang 621000, China
• Received:2021-03-16 Revised:2021-05-20 Published:2021-05-20
• Supported by:
National Key Research and Development Program of China (2019YFA0405202); National Natural Science Foundation of China (11802324,12002361); National Numerical Wind Tunnel Project

Abstract: Shock wave/boundary layer interaction in hypersonic turbulence flows can cause significant changes in key parameters such as aerodynamic force and aerothermal environment, therefore drawing extensive attention in the design and optimization of high-speed vehicles. The most widely used approach for turbulent simulation of such vehicles is RANS modelling with eddy viscosity models. Many studies have focused on the modification and improvement of the turbulence models to obtain better prediction in such flows. Nevertheless, studies on the RANS equations, particularly those on the role of the Turbulent Kinetic Energy(TKE) in the transport equations of mean variables, are rare. We investigate the influence of three TKE terms on the RANS equations using the k-ω SST model in the simulation of a hollow cylinder-flare flow of Mach number 7.05. The action mechanism of each individual TKE term on the prediction of hypersonic shock wave boundary layer interaction is analyzed qualitatively and quantitatively. The results show that these TKE terms have a significant impact on the flow prediction in the Shock Wave/Boundary Layer Interaction (SWBLI) area, particularly on the size of the separation region. Omission of one TKE term could lead to shrink of the separation bubble to only 40% of that without omission; in contrast, ignoring another TKE term would enlarge the separation length by more than 30%. The theoretical analysis of the mean momentum and energy equations indicates that this strong influence is mainly introduced by the significant change of the effective mean pressure field when the TKE terms are ignored. This will, consequently, lead to a change in the adverse pressure gradient near the separation point, resulting in a clear variation in the predicted length of flow separation.